(19)
(11) EP 0 454 123 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.09.1992 Bulletin 1992/36

(43) Date of publication A2:
30.10.1991 Bulletin 1991/44

(21) Application number: 91106704.9

(22) Date of filing: 25.04.1991
(51) International Patent Classification (IPC)5: H05K 7/20
(84) Designated Contracting States:
DE FR GB

(30) Priority: 26.04.1990 JP 110993/90

(71) Applicant: NEC CORPORATION
Tokyo (JP)

(72) Inventor:
  • Hosaka, Tadao, c/o NEC Koufu, Ltd.
    Koufu-shi, Yamanashi (JP)

(74) Representative: VOSSIUS & PARTNER 
Postfach 86 07 67
81634 München
81634 München (DE)


(56) References cited: : 
   
       


    (54) Cooling apparatus


    (57) A cooling apparatus for cooling a given device which is incorporated in a computer or similar electronic equipment (3) and generates heat by circulating a liquid coolant through the device (30) of interest. A secondary cooling liquid exchanges heat with a primary cooling liquid in a heat exchanger (13) and then flows into the device (30) of the equipment (3). When the difference in temperature between the secondary cooling liquid and the interior of the equipment (3) decreases beyond a predetermined value, a heat exchanging mechanism is caused to stop operating. On the increase of the difference in temperature beyond the predetermined value, the heat exchanging mechanism is caused to begin operating again. Alternatively, the operation of a secondary cooling liquid feeding mechanism may be interrupted and then set up again on the basis of the above-mentioned difference in temperature.






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